29.3% is the change from 256 to 331
Calculation steps:
[( 331 - 256 ) ÷ 256] x 100 = 29.3%
Formula
Percentage change = [(331 - 256) / 256] x 100
Subtract the new number by the original number
331 - 256 = 75
75 ÷ 256 = 0.29296875
0.29296875 x 100 = 29.3%